等离子体目标-斯格明子纹理的拓扑分析
Analysis of the Topology of a Plasmonic Target-Skyrmion Texture
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中文总结 AI 辅助
研究等离子体纳米焦点中径向延伸的交替斯格明子和反斯格明子纹理，利用光发射电子显微镜和矢量偏振测量进行电场矢量及其拓扑的时空重建，证实斯格明子数振荡行为，表明非紧致场无法指定全局斯格明子数。
中文摘要 AI 辅助
拓扑概念常用于描述结构化光场，包括等离子体近场。基于斯格明子数的拓扑描述隐含地假设基础流形的紧致性。即使局部出现类斯格明子纹理，在扩展光场中通常也不满足紧致性。本文利用光发射电子显微镜研究了呈现径向延伸的交替斯格明子和反斯格明子纹理序列的等离子体纳米焦点。通过矢量偏振测量可对电场矢量及其拓扑进行完整的时空重建。实验证实了斯格明子数预期的振荡行为，并表明在这种非紧致场中无法指定全局斯格明子数。
英文摘要
Topological concepts are frequently used to describe structured optical fields, including plasmonic near fields. Topological descriptions in terms of skyrmion numbers implicitly assume the compactness of the underlying manifold. Even when skyrmion-like textures appear locally, the compactness is usually not fulfilled in extended optical fields. Here, we use photoemission electron microscopy to investigate a plasmonic nano-focus that exhibits a sequence of radially extending alternating skyrmion and antiskyrmion textures. The full spatio-temporal reconstruction of the electric field vectors and their topology is accessible by vector polarimetry. The experiments confirm the expected oscillatory behavior of the skyrmion number and demonstrate that a global skyrmion number cannot be assigned in such non-compact fields.
